import matplotlib.pyplot as plt;
import numpy as np;

x=np.linspace(0,1,400)
y1=x/(np.exp(x)-1)
y2=(2*np.exp(x)-1)/(np.exp(x)-1)
plt.figure()
plt.plot(x,y1,label='cond_f')
plt.plot(x,y2,label='cond_A')
plt.legend()
plt.savefig("nine.png")